Mathematical Foundation of Photogrammetry (Part of EE5358)
Mathematical Foundation of Photogrammetry (part of EE5358) Dr. Venkat Devarajan Ms. Kriti Chauhan Photogrammetry photo = "picture“, grammetry = "measurement“, therefore photogrammetry = “photo-measurement” Photogrammetry is the science or art of obtaining reliable measurements by means of photographs. Formal Definition: Photogrammetry is the art, science and technology of obtaining reliable information about physical objects and the environment, through processes of recording, measuring, and interpreting photographic images and patterns of recorded radiant electromagnetic energy and other phenomena. - As given by the American Society for Photogrammetry and Remote Sensing (ASPRS) Chapter 1 01/14/19 Virtual Environment Lab, UTA 2 Distinct Areas Metric Photogrammetry Interpretative Photogrammetry • making precise measurements from Deals in recognizing and identifying photos determine the relative locations objects and judging their significance of points. through careful and systematic analysis. • finding distances, angles, areas, volumes, elevations, and sizes and shapes of objects. • Most common applications: Photographic Remote 1. preparation of planimetric and Interpretation Sensing topographic maps (Includes use of multispectral 2. production of digital orthophotos cameras, infrared cameras, thermal scanners, etc.) 3. Military intelligence such as targeting Chapter 1 01/14/19 Virtual Environment Lab, UTA 3 Uses of Photogrammetry Products of photogrammetry: 1. Topographic maps: detailed and accurate graphic representation of cultural and natural features on the ground. 2. Orthophotos: Aerial photograph modified so that its scale is uniform throughout. 3. Digital Elevation Maps (DEMs): an array of points in an area that have X, Y and Z coordinates determined. Current Applications: 1. Land surveying 2. Highway engineering 3. Preparation of tax maps, soil maps, forest maps, geologic maps, maps for city and regional planning and zoning 4.
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